Stroller frame



FIG. 1 is a perspective view of a stroller frame showing my new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line showing of some parts and the stroller seat is included for the purpose of illustrating environment and forms no part of the claimed design. 

The ornamental design for a stroller frame, as shown and described. 